WEBVTT 00:01.130 --> 00:01.760 Okay. 00:01.760 --> 00:08.960 Once we have added our rest framework tool to our Django, let's use it now. 00:08.960 --> 00:12.740 So we'll close these settings because we won't need it anymore. 00:12.740 --> 00:18.680 And what I will do is I will open the demo and I will create a new file and that file I will name it. 00:18.680 --> 00:22.730 Serializers Serializers. 00:22.850 --> 00:32.480 PY So basically here we will store the serializers here and I will explain you later on what the serializer 00:32.480 --> 00:33.020 is. 00:33.020 --> 00:38.030 I think it will be easier, if you will, when to understand it when you see it. 00:38.030 --> 00:46.340 So first thing we need to do from rest framework that's available for us because we just installed it. 00:46.370 --> 00:49.550 Import serializers. 00:49.790 --> 00:54.320 So we have that imported and then we can create a new serializer here. 00:54.740 --> 00:58.310 And there is a few way that we can actually create a serializer. 00:58.310 --> 01:05.900 But I will do a modal serializer and that will ease for in my opinion, that's the easiest way and more 01:05.900 --> 01:07.340 efficient way to work. 01:07.400 --> 01:09.410 Then everything will be based on models. 01:09.410 --> 01:14.180 So you can nicely sync in views, models and serializers. 01:14.180 --> 01:17.900 So we'll create our class and then we name it. 01:17.900 --> 01:19.670 So what do we want to do? 01:19.670 --> 01:22.610 First we want to display the book. 01:22.610 --> 01:34.790 So Book Serializer, and then inside we can include some built in Serializers modal serializer like 01:34.790 --> 01:37.580 that class. 01:39.480 --> 01:41.610 Meta model. 01:42.750 --> 01:45.510 And then we'll pick what model we would like to use. 01:45.540 --> 01:50.610 Obviously for us it will be book, but I also will need to import. 01:50.610 --> 01:53.280 So we are in the same folder. 01:53.280 --> 02:00.240 So from models import book, so dot models import book and now the book is available. 02:00.240 --> 02:02.580 And then here we can decide. 02:06.090 --> 02:08.010 What fields will include. 02:08.010 --> 02:11.790 So let's start with title like that. 02:11.790 --> 02:20.400 So we've created our serializer and what we are doing here is we name our serializer, we pass a built 02:20.400 --> 02:28.500 in Django methods and then we are telling, okay, we will use our model book and then we would like 02:28.500 --> 02:30.900 to display title fields. 02:30.930 --> 02:32.790 That's it for our serializer. 02:32.790 --> 02:34.650 At the moment we don't use it anywhere. 02:34.650 --> 02:37.650 So let's go back to the views. 02:38.680 --> 02:44.860 And in the similar way we've used before, we can create to here another class. 02:44.860 --> 02:48.240 So we'll do class and we'll do a view set. 02:48.250 --> 02:52.330 So I will import view set from Django Rest framework. 02:52.810 --> 03:01.480 So from rest framework import view sets like that. 03:01.570 --> 03:08.530 So my class will be will be we will use similar conventions we use with serializer. 03:08.530 --> 03:21.730 So we'll do book view set like that and then we can pass view sets and then we can have model modal 03:21.790 --> 03:22.570 view set. 03:23.410 --> 03:32.230 So basically we are creating a built in view for our books that will use all power of Django and it 03:32.230 --> 03:36.820 will create the option for the Http method for us. 03:36.820 --> 03:38.390 And I will show you that in a second. 03:38.390 --> 03:46.250 So serializer class and this is place where we actually tell which serializer we would like to use. 03:46.250 --> 03:53.570 So we have one serializer, and I will use this serializer here, but we don't have it available yet 03:53.570 --> 03:54.200 in this file. 03:54.200 --> 04:01.820 So what we need to do is we need to import so from dot serializer dot because we are in the same folder 04:01.820 --> 04:07.010 import book serializer one this is here, then we can use it. 04:07.010 --> 04:13.850 So for now, just to omit some confusions, I will remove all of what we had before. 04:13.850 --> 04:14.930 I will need to also. 04:17.850 --> 04:23.460 Correct the URLs in a second, but this is basically what we have seen so far. 04:23.460 --> 04:28.230 So we have a imported view set and then we have our serializer from another file. 04:28.230 --> 04:37.260 And then we are telling that setting up a new view set and actually we have like that view set and then 04:37.260 --> 04:38.610 a serializer class. 04:38.610 --> 04:40.200 It's a book serializer. 04:40.710 --> 04:43.650 Also here we need to decide. 04:45.310 --> 04:48.430 What is the query set for this view? 04:48.460 --> 04:56.080 The query set is something that we've done before and that will be our book objects. 04:57.400 --> 05:05.350 And then all and this is we are telling if we ever use this view set, what query set we would like 05:05.350 --> 05:08.800 to use and basically we will do use all books. 05:08.830 --> 05:11.500 Also, this big book needs to be imported. 05:11.500 --> 05:12.610 So from. 05:13.620 --> 05:16.650 Models where we have our book import book. 05:16.680 --> 05:21.420 Now we have we don't have any errors and then we have our view set here. 05:21.870 --> 05:23.220 So I will save it. 05:23.250 --> 05:29.460 Now we have Serializer and that serializer will use our book model and display title. 05:29.460 --> 05:31.200 And then we have a view set. 05:31.230 --> 05:32.610 The way we had it before. 05:32.610 --> 05:35.520 It was a simple class or a function. 05:35.520 --> 05:42.800 This one we this time we use model view set and I will show you how powerful that is in a second. 05:42.810 --> 05:46.470 So we have this and then we need to go to the URLs. 05:46.860 --> 05:55.560 So we need to instead of having this function passed to the our URL patterns, we'll use a router. 05:56.580 --> 06:01.680 So let's import from rest framework import. 06:03.370 --> 06:07.960 Routers and then we can create a new router here. 06:08.410 --> 06:11.860 So router, we can name it as we like. 06:12.100 --> 06:17.310 And then routers, which is that what we have imported here? 06:17.320 --> 06:19.600 And then we will use default router. 06:20.770 --> 06:21.520 Like that. 06:21.520 --> 06:26.710 So we have a new variable, a router and using rest framework routers. 06:27.370 --> 06:32.710 So here we can do router and then register. 06:32.860 --> 06:37.680 And then what we can do is we can register a URL. 06:37.690 --> 06:40.450 In our case it will be books. 06:42.130 --> 06:46.630 And then we can pass a view set. 06:46.780 --> 06:53.260 So we have a book view set here and we will pass to our router like that. 06:53.290 --> 06:55.290 We also need to import it. 06:55.300 --> 06:56.710 So from. 06:59.050 --> 07:03.220 Dot views, import view said like that. 07:03.220 --> 07:08.000 And the last thing what we need to do is we need to include it in our path. 07:08.020 --> 07:14.560 So I will remove this so we'll have an empty path here and then we can do include. 07:14.590 --> 07:16.420 So include. 07:17.650 --> 07:22.960 This is gone already, so we need to import that as well. 07:23.330 --> 07:25.390 We don't need this anymore. 07:25.990 --> 07:31.240 And then we will include here our router URLs. 07:34.170 --> 07:34.950 Like that. 07:35.190 --> 07:39.120 So basically what's happening here is we have our path. 07:39.150 --> 07:45.930 Remember, this path is already inside our demo, so it will be URL slash demo and whatever. 07:45.930 --> 07:47.210 Here we'll have it. 07:47.220 --> 07:50.820 It will be accessible through from the router. 07:50.820 --> 07:55.920 So at the moment we have register only one model, which is books. 07:55.920 --> 08:02.210 That books will go here and then it will use all what's available on the view set. 08:02.220 --> 08:04.530 So let's run our server now. 08:10.130 --> 08:13.280 A this supposed to be as URLs. 08:14.300 --> 08:16.550 I will run the server again. 08:17.800 --> 08:19.690 And then we have our server running. 08:19.690 --> 08:22.000 So let's come back here. 08:22.590 --> 08:24.090 To our. 08:26.420 --> 08:26.900 Demo. 08:29.420 --> 08:31.190 And look at that. 08:31.220 --> 08:33.560 Now we have another view. 08:33.560 --> 08:38.570 And that view comes free with the Django rest framework, as you can see here. 08:38.570 --> 08:43.910 And that's kind of UI for managing our rest. 08:44.120 --> 08:47.870 So what we see here, we have some methods here. 08:47.870 --> 08:58.100 So basically if I will use this URL in some kind of API browser and I will show you later on how we 08:58.100 --> 09:01.310 can do that, then I will see a Json. 09:01.310 --> 09:09.380 So what we can do is I can click on this link and you can see here I'm seeing a list of our books. 09:10.010 --> 09:13.190 This is what we added in our database. 09:13.190 --> 09:21.560 And this here, this part, it's a Json, it's an array of objects and each object has a title and a 09:21.560 --> 09:22.160 value. 09:22.160 --> 09:26.870 So this is what we will use actually in our front end application. 09:26.870 --> 09:35.000 And the reason why you see title here and nothing else is because we added in the serializers here. 09:35.000 --> 09:42.380 So if I will do another field description and let's say price. 09:44.860 --> 09:45.430 I will save it. 09:45.430 --> 09:55.090 Now coming back here, refresh and you can see for each object here we have title description and price 09:55.210 --> 09:56.410 available for us. 09:56.410 --> 10:03.250 So in the serializers we decide what should be included in our object. 10:03.250 --> 10:06.610 So next time we will use a front end application. 10:06.610 --> 10:10.780 I would like to have a list of books from our backend. 10:10.810 --> 10:14.380 What we need to do is we need to use that URL. 10:14.380 --> 10:20.200 So our domain then demo, which is our application and then books. 10:20.200 --> 10:27.610 Books will register that as a view set in our router and then it will give us an array of objects like 10:27.610 --> 10:35.260 that and then we can do whatever we will we want we need to do in our front end application. 10:35.260 --> 10:38.950 So this is how it works and how the Django Rest framework works. 10:38.950 --> 10:42.190 This is just a handy another UI that we can use. 10:42.220 --> 10:45.650 And also you have another section for posting the data. 10:45.650 --> 10:54.410 And if I can, uh, go for example here books one and then slash, you can see here also I can update 10:54.410 --> 11:01.160 the data here and I will show you later on how we can actually use that different methods. 11:01.160 --> 11:07.160 So what's available for us is get put, patch, delete head options and so on. 11:07.160 --> 11:11.270 So this is typical methods for a rest API.